POSEIDON Examples
Ernesto
February, 2018
Policy-making with POSEIDON
- Understanding incentives
- Controlling incentives
- Improving Policy
Nudging targets
- 200 Fishers
- 2 Species of fish:
- Selective Gear
No policy

Policy
- Problem:
- Expensive stock being depleted
- Long term loss of profitability
- Constraints:
- Cannot enforce gear switch
- Cannot remove fishers
- Question:
- Can we tax blue or subsidize red to maximize long term profits?
Model for scenario evaluation
- Ban blue landings when stock below a threshold

Model for optimization
- Find % tax on blue to maximize 30-years profits

Fine-tuning ways and means
- New Objective:
- Need to land approximately 600 blue fish a day
- Problem:
- Question:
- Can we adjust incentives depending on landings?
Difficult Problem

Complicated Solutions

Complicated Solutions 2

Winners and Losers
- One species of fish
- Two kinds of fishers:
- Large Commercial Vessels
- Small Fishing Boats
- Problem:
Policy
- Problem:
- Overfishing
- Low profits for small fishermen
- Constraints:
- Cannot regulate small boats
- Cannot enforce quotas
- Can only implement one MPA
- Question:
- Where should we place this MPA?
- Who wins and who loses?
Pareto Front

Buyouts
- New Constraint:
- We cannot impose any MPA
- We can only buy large vessels out of the market
- Question:
Scenario Evaluation
